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GSA Bulletin: From Titan to Tibet
Date:11/27/2012

ssic and common features found in alpine landscapes. And, although they are typically associated with glacial erosion, they owe much of their character to subaerial processes: Above the glacier, debris flows, avalanches, and rockfalls sculpt the headwall, while beyond the glacier, streams and sheetwash whisk away Muir's "mountain meal." In this work, Johnny W. Sanders and colleagues develop a sediment budget -- a framework that describes sediment sources and transport pathways in a region of interest -- for an alpine cirque in British Columbia, Canada. They then quantify the sediment budget terms at a cirque in the Canadian Rockies using field measurements and remote sensing techniques. Their results indicate the glacier is lowering its bed at about 0.5-0.9 mm per year. The subaerial headwall is backwearing at about 1.2 mm per year, but their data do not preclude a rate several times faster than this. These rates (Order 1 mm per year) are comparable to those measured at much larger glaciers and further confirm that cirque glaciers are fundamentally the same as their larger brethren, only smaller.


Late Cenozoic evolution of the Lunggar extensional basin, Tibet: Implications for basin growth and exhumation in hinterland plateaus
William H. Woodruff Jr. et al. (Brian K. Horton, corresponding), Dept. of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78712, USA. Posted online 21 November 2012; http://dx.doi.org/10.1130/B30664.1.

The Lunggar rift basin at 4.5 to 5 km elevation in west-central Tibet records the late Cenozoic history of east-west crustal extension within Earth's highest continental plateau. New sedimentologic, structural, and thermochronological data help define the depositional and exhumational history of the basin and the adjacent Lunggar range (5.5 to 6.5 km elevation), which has been uplifted duri
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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